664807941 has 18 divisors (see below), whose sum is σ = 1117058982. Its totient is φ = 379890000.

The previous prime is 664807921. The next prime is 664807987. The reversal of 664807941 is 149708466.

664807941 is a `hidden beast` number, since 66 + 480 + 79 + 41 = 666.

It can be written as a sum of positive squares in only one way, i.e., 508682916 + 156125025 = 22554^2 + 12495^2 .

It is not a de Polignac number, because 664807941 - 2⁵ = 664807909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664807901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 753310 + ... + 754191.

Almost surely, 2^664807941 is an apocalyptic number.

It is an amenable number.

664807941 is a deficient number, since it is larger than the sum of its proper divisors (452251041).

664807941 is a wasteful number, since it uses less digits than its factorization.

664807941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507521 (or 1507511 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 664807941 is about 25783.8697832579. The cubic root of 664807941 is about 872.7678358248.

The spelling of 664807941 in words is "six hundred sixty-four million, eight hundred seven thousand, nine hundred forty-one".